<h3>Small</h3>
<section>
  <button [fuiBtn]="color" size="sm" *ngFor="let color of btnColors">{{color}}</button>
</section>

<h3>Large</h3>
<section>
  <button [fuiBtn]="color" size="lg" *ngFor="let color of btnColors">{{color}}</button>
</section>